[sdarmayuda]

Hi,

I'm quite new to this Forum and this Software. I'm trying to simulate an Fluid Coupling (Hydraulic Coupling) using ANSYS Fluent r17.2 (Academic Ver.). I want to give a Torque instead of a constant rotational velocity as my input. Therefore, it looks like I have to write an UDF File for a changing rotational velocity (ramp) in respect of time. And until certain rotational velocity, it will rotate constantly. I have found a similar code for this case and tried to modify the code.

Here it is:

#include "udf.h"
#define omega_a 0.001 /* starting omega */
#define omega_b 7500 /* final omega */
#define delta_omega 0.1 /* incremental omega */
#define Niter 10 /* iteration update interval */
DEFINE_ADJUST (myadjust,domain)
{
int zoneID;
int iter= (nres==0)?(1):((int)count2[nres-1]);
float omega;
Thread *tc;
zoneID = 2;
tc = Lookup_Thread(domain,zoneID);
if ((iter%Niter)==0)
{
omega = omega_a + (iter/Niter)*delta_omega;
if (omega > omega_b)
{omega = omega_b;}
THREAD_VAR(tc).fluid.omega = omega;
Message("At iter=%d - update omega to %fn",iter,omega);
}
}

When I try to interpret the c file in Fluent, it always gives me an Error: ''structure reference not implemented''. Can anyone tell me what's wrong with my udf file? Thank you very much for reading. Any help would be much appreciated.

Best regards,
Darma